.container{
    overflow: hidden;
    width: 800px;
    height: 600px;
    /*border: 1px solid pink;*/
    max-height: 600px;
    border-radius: 10px;
    margin: 100px auto 0;
    /*background-color: #ccc;*/
    box-shadow: 1px 1px 10px rgba(0,0,0,.2);
}

.container .body{
    overflow: scroll;
    width: 100%;
    height: 70%;
}

.container .body .line{
    padding: 15px;
    border-bottom: 1px solid #ccc;
}
.container .body .avatar{
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-bottom: -10px;
}

.container .inp_area .upload{
    display: flex;
    flex-direction: row;
    height: 180px;
}
.container .inp_area .upload .message{
    outline: 1px solid skyblue;
    padding: 10px;
    flex: 8;
    font-size: 18px;
    border: none;
    /*border-top: 1px solid pink;*/
    resize: none;
    transition: all .5s;
}
.container .inp_area .upload .message:focus{
    outline: 1px solid red;
}
.container .inp_area .upload .ok{
    flex: 2;
    border: none;
    background-color: skyblue;
    color: #fff;
    font-size: 20px;
    transition: all .5s;
    border-radius: 10px;
}
.container .inp_area .upload .ok:hover{
    background-color: deepskyblue;
}